Farm

• Once you enter the training building, press a button on your controller and close the popup window with your mouse (this is to make KMS more consistent for Farm Defence)

• Training : Defence 6 KMS (keep playing the minigame during KMS), Health 20 KMS, Power 14, Special 20 (use controller pause button and mash your mouse + spacebar at the same time for optimal speed, keep training for ~15 more seconds to get additional coins), Speed 20 KMS (do the 1s normally, then spam as soon as it starts doing the 2s, then do KMS and keep spamming every key)

• Buy Boomerang in the shop and do the 3 battles. For the orange duck (middle one), skip the special by spamming the mouse before your turn (it's not needed since he dies anyway with a regular attack, and it saves time)

Forest

• Training : Health 36 KMS, Power 40 KMS (be careful, as you have to click in a different spot than usual since the pause screen is rotated for some reason), Speed 40 (as long as you can do it in 1-2 cycles doing it glitchless saves time over KMS)

• Do the tourney and upgrade Boomerang to lv3 before the first guy (you can upgrade weapons and armor during the loading screen). For the second guy, once he gets to low HP (under 50), do the special skip again like for the orange duck in Farm.

Mountain

• Training : Defence 60 KMS (press a button on your controller after doing KMS for the first time, then every time it stops : click in the spot where you would normally click to start KMS, and press a button again, I usually press a button twice to make sure it counts properly as I've had some issues with it previously), Power 60 KMS, Speed 60 KMS (make sure you are going as horizontal as possible for optimal XP gain)

• Buy Shovel and Rain Hat in the shop and do the tourney (don't upgrade anything).

Desert

• Training : Defence 80 KMS (keep playing the minigame during KMS), Health 80 KMS (keep playing during KMS so you can get coins), Power 80 (you can pause buffer to stall the enemy ducks but it's not required if you're good enough), Speed 80

• Fight the blue duck on the way to the shop so you can get Watergun

• Do the tourney, upgrade Watergun to lv4 before the first guy.

Swamp

• Training : Defence 100 KMS (restart every ~5 levels when the bombs start appearing faster, do the same strat that you did in Mountain Defence if you stop getting XP), Health 100 (just hold right to get XP), Power 100 KMS (keep playing the minigame to get coins to be safe, but I'm not completely sure it's needed)
• Do the tourney, upgrade Watergun to lv5 before the first guy.

City

• Training (Grand Dojo) : Farm Special 100, Farm Speed 100 (don't do KMS here, do the 1s then spam every key as soon as it starts giving you 2s and do that again until you get to level 100)
• Buy Laser Gun in the shop and do the tourney, upgrade Laser Gun to lv2 before the first guy.